I bought a ner genny for my 73' 2000 diesel. Took the old one odd and put a little liquid wrench on the pulley to soak for a day. Pulley came off pretty good after that. Installing toe fan blade & pulley on the new genny went pretty easy. The problem is, I can only get about a half a nut on the bolt to hold it all on. I did use a weak impact. I noticed the original nut was only about 1/2 the thickness of the new nut. I thought about just using the original nut but it's a little boogered up inside for some reason. I'm concerned with only a half nut that it will come off and I'll have a real mess. Any thoughts would be appreciated.